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scripts: support compile_commands.json in gen_app_partitions.py

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Fixes: #40590

This commit updates gen_app_partitions.py to include only files present
in the current build by extracting the information from the CMake
generated `compile_commands.json` file.

This ensures that object files in sub-projects, such as `empty_cpu0`,
will not be considered by the script.

Using the compile_commands.json instead of walking the whole build tree
for finding object files also improves performance:

Time of executing `gen_app_partitions.py` (Old):
__________________________
Executed in  480.06 millis
   usr time  425.83 millis
   sys time   49.55 millis

Time of executing `gen_app_partitions.py` (New):
________________________________________________________
Executed in   76.22 millis
   usr time   49.00 millis
   sys time   24.59 millis

Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>
This commit is contained in:
Torsten Rasmussen 2021-11-24 15:35:47 +01:00 • committed by Anas Nashif
commit f643b8b369
3 changed files with 34 additions and 1 deletions
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2
CMakeLists.txt
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@ -880,7 +880,7 @@ if(CONFIG_USERSPACE)
OUTPUT ${APP_SMEM_UNALIGNED_LD} ${APP_SMEM_PINNED_UNALIGNED_LD}
COMMAND ${PYTHON_EXECUTABLE}
${ZEPHYR_BASE}/scripts/gen_app_partitions.py
-d ${OBJ_FILE_DIR}
-f ${CMAKE_BINARY_DIR}/compile_commands.json
-o ${APP_SMEM_UNALIGNED_LD}
$<$<BOOL:${APP_SMEM_PINNED_UNALIGNED_LD}>:--pinoutput=${APP_SMEM_PINNED_UNALIGNED_LD}>
${APP_SMEM_PINNED_PARTITION_LIST_ARG}